Like its MLB catchers equipment, Under Armour white labels their elbow and leg guards, meaning they have another company make them, then slap UA logos on them.
We know that Vlad’s guards are most similar to the Japanese style sold by companies like Belgard and Nine Sports, though 44Pro offers a pretty sick custom builder for their similarly-made guards. We’d guess that 44Pro’s are coming from the same place as UA’s. Customize at the link.